Multi-hazard loss analysis of tall buildings under wind and seismic loads

Venanzi, Ilaria; Lavan, Oren; Ierimonti, Laura; Fabrizi, S.

doi:10.1080/15732479.2018.1442482

Cited by 58 publications

(47 citation statements)

References 54 publications

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“…As reported also in references [30,31], ground shaking induces more displacement than wind in the structure being studied for the range of wind speeds and ground motion considered.…”

Section: Shock and Vibrationsupporting

confidence: 56%

“…Multihazard assessment of the benchmark building was presented by Venanzi et al [31] using a linear elastic model. ey tested the response of the building under wind and earthquake forces.…”

Section: Numerical Studymentioning

confidence: 99%

“…Consideration of multihazard performance is therefore important, especially for very tall and other structures which are sensitive to wind. A few studies have presented performance of buildings with/without vibration controller devices under both wind and earthquake excitations [25][26][27][28][29][30][31][32][33][34]. ese studies show that while earthquake ground motions cause large floor acceleration demand, wind forces induce large interstory drift demands in tall buildings.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of a Benchmark Building Installed with Tuned Mass Dampers under Wind and Earthquake Loads

Elias

Rupakhety

Ólafsson

2019

Shock and Vibration

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This study presents analysis of a benchmark building installed with tuned mass dampers (TMDs) while subjected to wind and earthquake loads. Different TMD schemes are applied to reduce dynamic responses of the building under wind and earthquakes. The coupled equations of motion are formulated and solved using numerical methods. The uncontrolled building (NC) and the controlled building are subjected to a set of 100 earthquake ground motions and wind forces. The effectiveness of using different multiple TMD (MTMD) schemes as opposed to single TMD (STMD) is presented. Optimal TMD parameters and their location are investigated. For a tall structure like the one studied here, TMDs are found to be more effective in controlling acceleration response than displacement, when subjected to wind forces. It is observed that MTMDs with equal stiffness in each of the TMDs (usually considered for wind response control), when optimized for a given structure, are effective in controlling acceleration response under both wind and earthquake forces. However, if the device is designed with equal mass in every floor, it is less effective in controlling wind-induced floor acceleration. Therefore, when it comes to multihazard response control, distributed TMDs with equal stiffnesses should be preferred over those with equal masses.

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“…As reported also in references [30,31], ground shaking induces more displacement than wind in the structure being studied for the range of wind speeds and ground motion considered.…”

Section: Shock and Vibrationsupporting

confidence: 56%

“…Multihazard assessment of the benchmark building was presented by Venanzi et al [31] using a linear elastic model. ey tested the response of the building under wind and earthquake forces.…”

Section: Numerical Studymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of a Benchmark Building Installed with Tuned Mass Dampers under Wind and Earthquake Loads

Elias

Rupakhety

Ólafsson

2019

Shock and Vibration

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“…Moreover, from a life-cycle cost perspective, often both wind and earthquakes are prone to provoke damage and produce losses independently of which one appears to dominate the design. To deal with these hazards [1]- [3] recommended to adopt a multi-hazard approach in the analysis.…”

Section: Introductionmentioning

confidence: 99%

“…Because of the differences in terms of frequency range, intensity and structural responses affected [22], an important obstacle to unify winds and earthquakes in a sole optimization procedure is finding a common parameter for these hazards. Previous investigations have pointed towards using economic criteria such as damage-related losses [23] or life-cycle cost (LCC) [3], [24]. The LCC seems to be an attractive option to work as optimization criteria due to its capability of describing losses associated to different performance levels consistently with performance-based engineering (PBE) concepts [25], encompassing ideas of risk probability and structural reliability within the losses assessment [26].…”

Section: Introductionmentioning

confidence: 99%

Life-Cycle Cost Optimization of Tuned Mass Dampers for Tall Buildings Subjected to Winds and Earthquakes

Kleingesinds¹,

Lavan²,

Venanzi³

2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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In the last decades, much research has been dedicated to developing methodologies to optimize dampers for wind or seismic control. However, little investigation has been performed to deal with multi-hazard demands. Nevertheless, previous works have shown that from a life-cycle loss perspective winds and earthquakes may be equally relevant to many tall buildings. Thus, methodologies for multi-hazard loss optimization of tall buildings with dampers are of much need. To join these hazards in a sole optimization procedure, we adopt the life-cycle cost (LCC) resultant from wind and earthquakes as a unified design criterion. This work presents a multihazard optimization methodology of Tuned Mass Dampers (TMDs) in tall buildings. The methodology is applied to a 76-story building, employing the LCC as objective function. A Multiple TMDs system composed of four TMDs is considered on the top floor, assigned to dampen the first four modes. The TMDs mass, damping ratio and frequency are taken as design variables, and different constraints are imposed on the total added mass and individual TMDs frequencies. The linear dynamic analysis results are used to calculate the LCC through a platform based on the PEER equation. An efficient genetic algorithm combined with a pattern search algorithm permits to achieve the optimal solutions. A purely intuitive MTMDs design based on modal analysis would suggest largest masses should be assigned to the dominant modes. However, the results reveal this rationale could be misleading, demonstrating the need for optimization techniques to obtain adequate dampers designs. This innovative design procedure can improve long-time performance and deliver an optimal design from economic standpoint.

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Bi‐tuned semi‐active TMDs: Multi‐hazard design for tall buildings using gradient‐based optimization

Kleingesinds

Lavan

2021

Structural Contr & Hlth

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Current research on tall buildings design has shown the need for multi‐hazard approaches in numerous practical cases. To improve the performance under hazard‐related horizontal loads, supplemental damping devices emerge as an efficient solution. For example, passive tuned massive dampers (TMDs) have been used in tall buildings for decades. However, since earthquakes and winds mobilize the structures in different ways, the multi‐hazard design of TMDs remains a difficult task. Thus, adaptive devices are an encouraging solution for this purpose. This research proposes an efficient use of existing semi‐active TMDs that were proposed for other purposes through tuning them exclusively to two sets of frequency and damping ratio: a set for seismic loads and a set for wind loads. These bi‐tuned STMDs would behave as passive dampers during any hazard event, but with an appropriate tuning. Because mechanical properties switch only at the beginning and at the end of seismic events, the control system required would be simple and reliable. An optimization‐based methodology is proposed to design multiple BSTMDs. The total added mass is minimized, while the building life‐cycle cost (LCC) is selected as a performance constraint. An efficient gradient‐based algorithm, originally developed for passive TMDs, is adapted for BSTMDs. Two problem formulations are proposed, to allow distinct design alternatives. The devices design is illustrated by four case studies. The examples show that BSTMDs may provide the same performance of their passive counterparts, using less than half of their total added mass.

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Multi-hazard loss analysis of tall buildings under wind and seismic loads

Cited by 58 publications

References 54 publications

Analysis of a Benchmark Building Installed with Tuned Mass Dampers under Wind and Earthquake Loads

Analysis of a Benchmark Building Installed with Tuned Mass Dampers under Wind and Earthquake Loads

Life-Cycle Cost Optimization of Tuned Mass Dampers for Tall Buildings Subjected to Winds and Earthquakes

Bi‐tuned semi‐active TMDs: Multi‐hazard design for tall buildings using gradient‐based optimization

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